For example...
For example, a sick man, who knows that his remedy and welfare lies in taking a bitter medicine, takes it easily, and a diver who believes that there are precious gems beneath the tides of the sea throws himself into the mouth of the tides without any apprehension; and returns to surface, after achieving his purpose.
However, if the ailing person or the diver are doubtful about the achievement of their objects or do not at all believe in the usefulness of their job, they either do not take any steps in that direction or, even if they do, they are faced with hardship and anguish. Hence, it is the very strength of belief and faith which solves all difficulties. Nevertheless, there is no doubt about the fact that achievement of one's target is associated with difficulties and obstacles.
It is, therefore, necessary for us to combat against those hurdles and to make necessary efforts in that behalf, so that all the obstacles may be removed with our full might. It has been said since olden times that wherever there is a flower (a prized object) there is also a thorn (difficulty) with it. The flower should, therefore, be plucked in such a way that the thorn does not prick one's hands or feet.
The Holy Qur'an has mentioned this subject (that the secret of success lies in faith in one's aim and steadfastness in its attainment) in a short sentence and has said: "As for those who say: 'Our Lord is Allah,' and take the right path.........." (Surah al-Fussilat, 41:30). (Viz. those who have faith in Allah and believe in a particular aim and then display steadfastness and fortitude, will definitely achieve their object and are helped by the angels).
Steadfastness and Fortitude of The Holy Prophet As a result of the special contacts of the Prophet before the 'general invitation' and his indefatigable efforts thereafter, a selected and faithful team came into existence against the forces of infidelity and idolatry.
The Muslims, who had embraced Islam secretly before the 'general invitation', developed complete acquaintance with those who responded to the Prophet's call thereafter and the bells of danger rang in all the assemblies of infidelity and polytheism.
No doubt it was quite easy for the strong and well-equipped Quraysh to crush a newly-born movement, but the reason for their being afraid was that the members of the movement did not belong to only one family but persons belonging to various families had also embraced Islam.